There are 9 time zones by law in the USA and its dependencies. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island, brings the total count to 11 time zones. The contiguous US has 4 standard time zones. In addition, Alaska, Hawaii, and 5 US dependencies all have their own time zones. As neither Hawaii nor the 5 dependencies use Daylight Saving Time (DST), there are only 6 corresponding DST time zones. Since Howland Island and Baker Island constitute the world's westernmost landmasses in relation to the International Date Line, making them the last places on Earth where any date exists, they are sometimes assigned a theoretical 12th time zone called Anywhere on Earth (AoE). Generalized Time Zones in United StatesTime Zone Abbreviation & NameOffsetCurrent TimePTPacific TimeUTC -8:00 / -7:00mar, 8.22.33MTMountain TimeUTC -7:00 / -6:00mar, 9.22.33CTCentral TimeUTC -6:00 / -5:00mar, 10.22.33ETEastern TimeUTC -5:00 / -4:00mar, 11.22.33The time zones in the contiguous US are often referred to by their generic name, without making a difference between standard time and Daylight Saving Time designations. For example, Eastern Time (ET) refers to Eastern Standard Time (EST) or Eastern Daylight Time (EDT), depending on which is currently in use. In practice, this means that the local time in these time zones changes when DST begins and ends. Note: Local time in these time zones changes when Daylight Saving Time begins and ends.Time Zones Not Currently Being Observed in United StatesOffsetTime Zone Abbreviation & NameCommencesUTC -9AKSTAlaska Standard Time3 nov 2024UTC -8PSTPacific Standard Time3 nov 2024UTC -6CSTCentral Standard Time3 nov 2024UTC -5ESTEastern Standard Time3 nov 2024The above time zones are used during other parts of the year. They will become active again after the next clock change as Daylight Saving Time begins or ends.Time Zones Being Used in Dependencies of United StatesOffsetTime Zone Abbreviation & NameDependencyTypeCurrent TimeUTC -12AoEAnywhere on EarthUS Minor Outlying IslandsTerritorymar, 3.22.33UTC -11SSTSamoa Standard TimeAmerican SamoaUnincorp. unorg. territorymar, 4.22.33SSTSamoa Standard TimeUS Minor Outlying IslandsTerritorymar, 4.22.33UTC -4ASTAtlantic Standard TimePuerto RicoUnincorp. org. territorymar, 11.22.33ASTAtlantic Standard TimeUS Virgin IslandsUnincorp. org. territorymar, 11.22.33UTC +10ChSTChamorro Standard TimeGuamUnincorp. org. territorymer, 1.22.33ChSTChamorro Standard TimeNorthern Mariana IslandsUnincorp. org. territorymer, 1.22.33UTC +12WAKTWake TimeUS Minor Outlying IslandsTerritorymer, 3.22.33The US dependencies don't use DST. There are 9 official time zones according to the law. In addition the uninhabited atolls of Baker Island (AoE) and Wake Island (WAKT) add to the time zone count, making 11 the total number of time zones in the US. Almost all states in the US use Daylight Saving Time (DST). Most of Arizona and Hawaii don't use DST. Indiana introduced DST in 2006.